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Illicit Discharge Detection and Elimination (IDDE) Program

Illicit Discharge Detection and Elimination (IDDE) Program 2025

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The Illicit Discharge Detection and Elimination (IDDE) Program for the City of Mercer Island, Washington, outlines a comprehensive strategy to identify and eliminate illicit discharges into the stormwater system. The document details the regulatory framework under the National Pollutant Discharge Elimination System (NPDES), mapping of municipal storm sewer systems, current ordinances, and recommendations for improvement. It emphasizes proactive investigation, public education, staff training, and immediate response procedures to address potential pollution sources effectively. The program aims to enhance water quality by monitoring and managing illicit discharges through systematic field assessments and community engagement.

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What is an example of an illicit discharge?

Another example of direct illicit discharge is when excess chemicals or household products are being poured directly into the storm drain. On the other hand, indirect illicit discharge would consist of sediment runoff, or nutrient and organic matter runoff with rainwater.

What causes an illicit discharge?

An illicit connection is any connection of wastewater into the stormwater system. An example of this might be a connection from a bathroom or a washing machine. The accidental spill or leak of an unsafe substance is also an illicit discharge.

What is illicit discharge?

An illicit (illegal) discharge is any discharge to a municipal storm sewer system storm drains, pipes, and ditches that is not composed entirely of stormwater. Pollutants end up in storm sewer systems in a number of ways, many of which are easily preventable.

What is an IDDE program?

Illicit Discharge Detection and Elimination. (IDDE) programs and the design and. procedures of local investigations of non- storm water entries into storm drainage. systems.

What is the illicit discharge detection and elimination program?

The goal of the Illicit Discharge Detection and Elimination Program is to identify, eliminate, and prevent the discharge of contaminated stormwater runoff into the Municipal Separate Storm Sewer System (MS4) or directly into surface waters.